- added in CNCJob preferences new preferences that allow compensation for the CNC bed skew/tilt (axes not being square one to another)

- all pre-processors are altered such they can adjust the gcode to use the compensation values set in Preferences -> CNC-Job section

preprocessors/Roland_MDX_20.py

@@ -60,8 +60,21 @@ class Roland_MDX_20(PreProc):
             x = p.x
             y = p.y
 
+        # formula for skewing on x for example is:
+        # x_fin = x_init + y_init/slope where slope = p._bed_limit_y / p._bed_skew_x (a.k.a tangent)
+        if p._bed_skew_x == 0:
+            x_pos = x + p._bed_offset_x
+        else:
+            x_pos = (x + p._bed_offset_x) + ((y / p._bed_limit_y) * p._bed_skew_x)
+
+        if p._bed_skew_y == 0:
+            y_pos = y + p._bed_offset_y
+        else:
+            y_pos = (y + p._bed_offset_y) + ((x / p._bed_limit_x) * p._bed_skew_y)
+
         # RML-1 unit is 0.01mm for X-Y moves (maybe on Z also?) so we multiply by 100
-        return ('Z' + self.coordinate_format + ',' + self.coordinate_format) % (float(x * 100.0), float(y * 100.0))
+        return ('Z' + self.coordinate_format + ',' + self.coordinate_format) % (
+            float(x_pos * 100.0), float(y_pos * 100.0))
 
     def rapid_code(self, p):
         if p.units.upper() == 'IN':